6 3 o SCIENCE PROGRESS 



ing scales in the impression of part of the skin ot a trachodont 

 dinosaur from the same formation, of which illustrations are 

 given in Mr. Lambe's paper. 



Further particulars of the structure of Chasmosaurus are 

 given by the same writer in a third communication {op. cit. 

 pp. 146-55), where a well-preserved skull of a trachodont 

 dinosaur from the Belly River beds is described as a new 

 genus and species, under the name of Gryposanrus mirabilis. 



In a fourth communication {op. cit. vol. xxvii. pp. 13-20) 

 Mr. Lambe describes two new generic types of Belly River 

 dinosaurs — one, a member of the carnivorous group, under the 

 name of Gorgosaurus libratus, and the other, a trachodont, as 

 Stephanosaurus marginatus. The latter, which is identified by 

 the author with a species previously described by himself as 

 Trachodon marginatus, is characterised by the great elevation 

 of the vertex of the imperfect skull, as well as by the shortness 

 of its beak. 



An apparently identical dinosaur is described by Mr. Barnum 

 Brown in the Bull. Amer. Mus. Nat. Hist. vol. xxxiii., under 

 the name of Corythosaurus casuarinus. The skull shows the 

 enormously elevated vertex, formed by the nasals, frontals, 

 and prefrontals. As minor features of the skull (the figure of 

 which is herewith reproduced) may be mentioned its relative 

 shortness, the narrow beak, and the small size of the narial 

 aperture. As Mr. Brown doubts the identification of Mr. 

 Lambe's specimen with M. marginatus, he may be justified in 

 giving a new name to his own specimen ; but as to the generic 

 identity of the two, there can be no reasonable doubt. 



At the close of this paper Mr. Brown proposes a revised 

 classification ot the Trachodontidce, which he divides into the 

 sub-families Trachodontince and Saurolophince, the latter char- 

 acterised by the presence of a cranial crest which is lacking 

 in the former. The first group is represented by the genera 

 Trachodon, Kritosaurus, Hadrosaurus, and Claosaurus, and the 

 second by Saurolophus, Hypacrosaurus, and Stephanosaurus. 



In another paper {op. cit. pp. 539-48) Mr. Brown discusses 

 Anchiceratops, a member of the horned group from the 

 Edmonton beds characterised by the great size of the knobs 

 bordering the nuchal flange, and the pair of large oval vacuities 

 by which the latter is pierced. Special interest attaches to this 

 type from the fact that it serves to explain the mode of origin 



